________ usually infects people whose immune system has been compromised, causing blackening or discolouration over the nose, blurred or double vision, chest pain, breathing difficulties and coughing blood.
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Infection that inflames air sacs in one or both lungs, which may fill with fluid.
With pneumonia, the air sacs may fill with fluid or pus. The infection can be life-threatening to anyone, but particularly to infants, children and people over 65.
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